Since new update stop won't work only pause

During playback I will play and stop and every few seconds the stop button won’t work. Only pause. And then I can’t do any edits. I have to close the project down and reopen. Then I get a couple of stops in before it breaks again.

This is since I installed the latest version today.

Is there anyone to contact about it?

You can log issues here: Issues · audacity/audacity · GitHub
(Requires a free GitHub account).

I cannot replicate this on W10 with the latest 3.5.1 release (or the latest alpha test build for the upcoming 3.6.0).